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Interaction of Aluminum Metaphosphates in the Setting of Potassium Silicate Solutions in Terms of the Crystalline Phase Composition.
ChemistryOpen ( IF 2.5 ) Pub Date : 2020-05-28 , DOI: 10.1002/open.202000060 Ali Masoudi Alavi 1 , Almuth Sax 1 , Peter Quirmbach 1
ChemistryOpen ( IF 2.5 ) Pub Date : 2020-05-28 , DOI: 10.1002/open.202000060 Ali Masoudi Alavi 1 , Almuth Sax 1 , Peter Quirmbach 1
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Aluminum phosphates are known as inorganic hardening agents for the setting of alkali silicate solutions, but only few studies have been published on the setting mechanism of potassium water glass. The solution behavior of two aluminum metaphosphates in alkaline environments were investigated photometrically determining the dissolved aluminum content. The crystalline phase composition of the hardened potassium silicate systems was determined by X‐ray diffraction. New insights into the setting mechanism were obtained concerning the structure of the aluminum metaphosphate and the SiO2/K2O ratio of three different potassium silicate solutions. With increasing pH value aluminum tetrametaphosphate reacts rapidly and forms crystalline potassium tetrametaphosphate dihydrate by an ion‐exchange‐reaction. In parallel, a depolymerization of the cyclic metaphosphate structure occurs leading to potassium dihydrogen phosphate as final fragmentation product. With aluminum hexametaphosphate no ion‐exchange reaction product was observed. Only potassium dihydrogen phosphate could be found in higher quantities compared to the reaction with aluminum tetrametaphosphate.
中文翻译：
偏磷酸铝在硅酸钾溶液凝固中的相互作用与晶相组成的关系。
磷酸铝被认为是用于碱金属硅酸盐溶液凝固的无机硬化剂，但关于钾水玻璃的凝固机理的研究很少。通过光度测定测定溶解的铝含量，研究了两种偏磷酸铝在碱性环境中的溶液行为。硬化硅酸钾体系的晶相组成通过 X 射线衍射测定。对偏磷酸铝的结构和三种不同硅酸钾溶液的SiO 2 /K 2 O比率的凝固机理获得了新的见解。随着 pH 值的增加，四偏磷酸铝迅速反应，通过离子交换反应形成二水合四偏磷酸钾结晶。与此同时，环状偏磷酸盐结构发生解聚，产生磷酸二氢钾作为最终的碎裂产物。对于六偏磷酸铝，没有观察到离子交换反应产物。与与四偏磷酸铝的反应相比，仅发现磷酸二氢钾的含量更高。
更新日期：2020-05-28
中文翻译：
偏磷酸铝在硅酸钾溶液凝固中的相互作用与晶相组成的关系。
磷酸铝被认为是用于碱金属硅酸盐溶液凝固的无机硬化剂，但关于钾水玻璃的凝固机理的研究很少。通过光度测定测定溶解的铝含量，研究了两种偏磷酸铝在碱性环境中的溶液行为。硬化硅酸钾体系的晶相组成通过 X 射线衍射测定。对偏磷酸铝的结构和三种不同硅酸钾溶液的SiO 2 /K 2 O比率的凝固机理获得了新的见解。随着 pH 值的增加，四偏磷酸铝迅速反应，通过离子交换反应形成二水合四偏磷酸钾结晶。与此同时，环状偏磷酸盐结构发生解聚，产生磷酸二氢钾作为最终的碎裂产物。对于六偏磷酸铝，没有观察到离子交换反应产物。与与四偏磷酸铝的反应相比，仅发现磷酸二氢钾的含量更高。
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